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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31ad54ed9d43b7459319d7dd44d17f5218e158fccaa0277d2f21b2d28b68f5d' 
  AND token = 'Yc1toa+/RtjHlJAxWQhLQLkz1S8bwMqCobJLFOG0zk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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