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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e668bda36a3f95bed0b7157c6ef1b3b871a5f1d124d7e0786c29f6e6b6e243' 
  AND token = 'eXojhLYoMxUcAtQTZSw1FzCj0pK90pMtavq57uf1jrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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