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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c2b67e514d1ee1d1a8604a4efc88510f93c2997ed8e8aafddb15967b2002da' 
  AND token = 'PpwZLh+7BQt6n8Ca6Eu5g+1o1Ck2QGtkin2ri47J1vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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