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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da55992471b436668a28cb87bcf8f8c20bd0e811d2d656781fc7cf1b1b660b77' 
  AND token = 'cuC6rM12PWjFq5gjPrq5G+aYrv3aLCR3WJsTFgESFOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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