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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197d133e5521106da9f2b1d770d8ed08c14268d6c2e94ae5204e5444b48d7e55' 
  AND token = 'LtSC/CZN5dVEQT+lTXZVSM3DVhlZvV8H6ZbKskFtM4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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