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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ed8c5bf153e6651055e5c87fc3222cd434a32b05d3b18281a81e7c609a034' 
  AND token = '12+hyGWghO1ZtrFSRSuGWD2rRulfwuFpN+lOXgnRKGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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