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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e93d0326ac5a85ea960b91a7e9e61ee5cf3bd3bf38c0ce325e02306ecae8e37' 
  AND token = 'LAfC/moO9O5Vl6aF4XRMtvBBvQ1twr9q3Zcc9BSRyZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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