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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1388cbe3a718a6143595ef9cff68502016908a2ad7fa48fcdc06830f54e02cf8' 
  AND token = 'q3DGyZi+D02njcsSpMS7u6eNWLP5q337pta7EEBCPVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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