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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695b232f8ae62b36fcb43e543283f820f13d6dffa35e3d84d38045ab49fad805' 
  AND token = 'b9qqEhMJZjbf2LX8AHRGy/yLhV7/0yTebV1v41SbS60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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