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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6ed9a57e295f4a868301b1d70583986f92166c860522bc147d3398c721a154' 
  AND token = 'HGj1a8iGGk2/DlMWziVCWtC5PDa7Yz+UMg88zLcpPMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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