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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99011018f13a88d022316c3f3922af0445f7b6c0fb67af815b2968fe60b7e5ca' 
  AND token = 'JBRif8THG0FE9pTZyrQVJwbp8EfLuRimJhcc49+Mn+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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