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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f6cd3b4b72b5a0868c50eba875625fee1846eb11967e35c3e71aadd7a86d67' 
  AND token = 'GuH+6idHn6yihNaih+hVqaY7BX/b4y7awH+0IbmFaRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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