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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e664b8a7e63962bcc012bb2d03ac4ce4705b541e67134e8df8fb255dd45efc' 
  AND token = 'x1MPLggUkfh8eB0pgIAEHg8/gBVJDP9YTWMr6YVvROA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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