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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67af0cc2c4c961b043d8c9d7ddb4441432d6deeadd2e69dc26bdb7a195920eee' 
  AND token = '6A3gzcpCTEK7qfcb+6g+yl1yMa09wd6k8TnXEUJe5Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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