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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798bb4e4e7d8a91c2fde7b618b03709b4959409ec2d110a8f722c0e26e1db5b6' 
  AND token = '1pN2scgAnIjNeFqHBDO2bP2IQ6ZEyqXyCK98MQRH3Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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