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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce348676b0ee9b3dd72dc259e7d29a95d6a6ac58b5c7810afab77c8c95002837' 
  AND token = 'h3iqH2vE8FgCUrnOclz/ABvtiD7jvwSWogUpqSq+n8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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