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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2f8eafae72a0f928836be81813f8cd8c4f89ca0cbab0d07010ba2882960812' 
  AND token = 'B2dCxIdqcen6brL9tJ76wLkldt9i2XDgAh9xjQQ7120=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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