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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd887f1205e88591c7adf4540a8eb267dcaf30edc25fd46224d85e47da2a228' 
  AND token = 'wwgCps0V4zf0NaECtL4eZq7X0Sm285kbNGS3C0qrtU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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