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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903319de11e283305793876c75a77bbd03638ad6be0ca84426a06824299bae56' 
  AND token = 'jrd+Qhmz/eYT3u+NKY2FDFB7C2nLEVlfHVUa1m0a95A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00319

JSON explain

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