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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9e58dfdab5ce65ecac22c7788b49dfc9a30edcc4fc64969d62d1aa1e2eaec7' 
  AND token = 'a2Wcgl9ugAmYyIu1u6BxmqASL5Do0TWVxoVIDWx3rpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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