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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d30434f798f0e626c1a9b54c777c8ae4a1d9e0211433c0db015836b394f29f' 
  AND token = 'dkRx1W9Y43NjQauRgV3VyYwe/duH82MoJ8HWvgmOnno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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