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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88db6d189bb7ee2f2195bbfd1c7a243c32bb86881fc11ee665a9e9610b7c0183' 
  AND token = 'sJVITQeXEhL22QIY5nWdIM9jgc81Ifh/HzZp4v4vmp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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