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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa49a9d0db2d1c4229109b38e192bd1c6dbcc893f7d494dd3ca65a5418ac44e' 
  AND token = 'Ku4SOd9DjpGH7hGJbq0o6TJiSLvjuKdCbg2/ohetzGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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