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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ef29677b6dcbf7bbe3d7f230db55aa4eb7f92c9ac264fa67bf0a81e81a594d' 
  AND token = 'BffPrYNgQ+hNgaCYrBaiSDnA0I6A9Kb1TRR+fVdP7Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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