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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcda9c1fe7954d345ac5589e7d1fafda7f32e2f395a8f8762ec2590fa03957b7' 
  AND token = 'P7y3h2WtuMNv34y53dBBZAMvcZ6TZxSl4ytTUOBeNyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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