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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae8c39cbf742100a3ded4b1357ce5f49ec3bc1f80f651cb89aea334916b1a19' 
  AND token = 'G86l9ZG8R9nOnCFTi/OyXVFE2bBNZkB+qTrEZ1oiNaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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