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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0c6e85c5caf6fa57200c26a8b770987c6cf87af9cca3c134c2f15d7e267e37' 
  AND token = 'K0Zj70vJA0pTtpCHRj0no82Va6VrjRnr/lLYePwVO0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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