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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9204b04e5e72d8c86d1617739de034c52b7c76dc1644dd1ce1a975d8828f2148' 
  AND token = 'BIasdcNpTNyh3bwSPPb0dCu7DjOwU7oSkZjhbEexUlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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