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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd908b4136234c2207951f1598ab05cb5c473a55dbc9d4a9758d9abf3efa32252' 
  AND token = 'ZErUukrbykmhs7Og0fDfdNNBy2E25GGpRNwy0cM1quI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00450

JSON explain

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