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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193b6edc8f3fd0ca3a95d3d31ae4397fe9abb4621ed608db0a1ab4b5cf9cf79b' 
  AND token = 'eRvFTRO5P8edyxMVrTWdYMfCafpzKtqxqp/WcHV5SGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}