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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6d59781bfc898b351b62ee4b6c57b7fac47ac5e5226ec2543b0ed2ab62ebc6' 
  AND token = 'tcNQk8euzzzpnK5bX11vXE7s0NGMJKKeX1ppaoht+Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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