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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be758d1f2bd966005a7ac023e51fef03af39f81adbea96aa8bfa8a1e12ded8b' 
  AND token = '16AkxVQbAXJrbW4NKDqDCZ5CbOjNL8E21Wc2A0dTExE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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