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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa0c91b9145c8fc40e6287adf5f6aa880ed2ec9e94ce7a30e9e40ab28ff3835' 
  AND token = 'v17Tk3bUYEnlCO+rWRR3e5Mb8q66Xsn3ikB7R98alaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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