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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb1effcaa609d21afe2c438b6318691de482d56b8adc4e5a161f89d3a49fbdb' 
  AND token = 'UrwcEXs2+O4xAQlZskOo73RARJme0ehoB6g2qZV6nxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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