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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecdb0bce74cb25ab5fe0d07232818a09023411058fc2ec586dc688dbea48f7a' 
  AND token = 'RqU0hyD02DBxVl7JF4gkle5TINTW7SkPTeo9xoyk02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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