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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3911a909bc9e5784cfd808651aeab3e7fc691895934022150e245416cec703' 
  AND token = 'iMHUJ7XxDYaTdLh/at1izo4QDSMEoXWBrd1/mWXxnBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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