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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97451538bde8d33d6fca466b49043620502428c3ca52cce710158f08bb3c1272' 
  AND token = 'QRUFtFDx6tsdrUC8BEXhh0/ac7eyX2zxJWeOAHO+5tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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