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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dae9ccd9ece50eaa7746e48dcd0a24cad336a074d08a4e1a414ac270fcbdbe4' 
  AND token = '5M4gjhjAPFxDvCs6ks/2XqfL/JS5L2xESvT7i3ZSVhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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