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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676cceba32165fdc50b0de8b864c096520b92e695e99e2b8ef6930bff2d56cf2' 
  AND token = 'SXj5sMOjSsTNDAMs9cZrVnFRnn7yDJn84ncwR7psx4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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