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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c4913badc6ff22e33cbb0007eb2bd7bda4b939ae1499f2f1c78e0e1209b7f2' 
  AND token = 'LAb5/ydOqD3Z/7AHTy/YWzpfw5o5V8FZXs3BD+i/ho4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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