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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3146a49b936ba0f880e0c2126a7a07e3a0b0259c448540d1c8722ea6db52f697' 
  AND token = 'wZQO+V8x+dDa8DJTYc4I5ajz62uscTxaHeB8WrxdXf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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