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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6027c8ab86f7910b0158259e495e6d315453f2aafd270408ae2a24e22525da00' 
  AND token = 'lQdSYhHQVcPti47C8MaEhr8oGHXDO4YMDPSSjBUAiQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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