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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd26e5ca4f4e1e59b02cf4de83edcb2de63e60a0779784c8796432e793ab30c' 
  AND token = '71AfHZGssBTYLqzbLMNrwV80jxzRymvHDNJ8CMMJuYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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