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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132579b11f9fd3ad5eba10b840898ba6f4f767d93a7333775fdd7f42bc85513d' 
  AND token = 'fENarj/YUg4jcN9bLFb5ZuXm3EUcVBSE3iLv232ZrZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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