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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492c29ad6ed299c19e2ee54769a52ea155bede4f05562fba83dc90b64cb00e05' 
  AND token = 'tTHdpjcpDT7LulAZUm96piypisxFBm4qj9pp8bQluE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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