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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233c9865da803fc2cf277f3c59df1ed268c2bca48f5ca6bf0ba7247536fb8d62' 
  AND token = 'v9FW+9nfGXLxd9aY5muIXa0fSzwysQoUE7Gs03Ul4Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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