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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea70424ad23b882db4f3ace99aee482ac7853f63026f085dc09382fab1eb90e3' 
  AND token = 'kQh2jWHMTc5Sk4nZlhU8w4TfHu2Ix48sXYn2EzGXz2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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