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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782a8a00c582f4c8770b5cb5b56a3657209e265e5cd396d2adebec9578151a31' 
  AND token = 'voqI1ep/tV1i2lTXSrUEihydtEMnGpucKj82NirCI1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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