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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d90f6b7449c0604dac5c85dc94f2fd10812113bbd5e596d8e6a189028609b46' 
  AND token = 'sHEnFrxoJjzxHcV8Z6FpitV4245sLQFnkvKUyo/GoA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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