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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ca66ce57af903ec36ccd8d40f2b189c89ca69b4c9a355b9799e8c1e50f09c5' 
  AND token = 'cvqq+NperOMW6UhsfcNz4dE8SDfuuyRueCMVlp/4oW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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