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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d1dde4a20900c6488ad6291a50a823197614b20119c5c8863b78aad839d92d' 
  AND token = 'f0HWLYQ1JDT2eHv4IKrKGlFaNMTJlXd2SYZGFLhF4f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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