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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7233a324b0f52c082add9c938967b4903098697447cd4f56702b336b27336be0' 
  AND token = 'N5jF2FAyWEf1GRTV6Vnw/OSiEpGT4W+PEdHnrW+usxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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