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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4268811e82ddb90eafcc6e8de0522a61eb07f66df93a0dcc9e048e5c60c028c' 
  AND token = 'NNrjs+oPcuCypqu7XSSsy03KH80aGmSWo5DR6QEQ390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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