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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ea367d2100cb2308a42fa7c9c8e497131bef85f68bb471cebd3a363ab9e56b' 
  AND token = 'WyQRLOu+v2mKCUEyrOOmgJhiSpcx5oaLd4Ljr6Qb12w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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