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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26651b3369c21b118e797180316c73fcfd4298e82ade9cf29b3b4a2eb43c0425' 
  AND token = 'Hq3u5AzE/jCk6SeuQccdSxxshpa/3wDIKg5ws03mhIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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