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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e89849df66cabb26bd097104ac70b5eff72c1faf84412d492575680283368e' 
  AND token = 'ZsH773AqDJTiJCwJUJDT7ynsTaAGojahSLOCD98Yu1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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