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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599353fd47774e0189d7c3f76aea071e12212b52083c800f90ba8f561b0fa809' 
  AND token = 'UA0KFEeNsG7hmkwqKId3T/kSkPtBo2CSRJpf0wikI9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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