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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60db8797de9ec004c79ca0d198a4c8848a9fff2e25377dc8c34624337ec256c' 
  AND token = 'JyaTdAIxdquw0IuIz3M0PaH3C8cYCTxwFJkt0ur88Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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