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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3222bdbf4b76be69f5ec5cd4b342d01c3fdeab41c075189e3bc06aa4aafaa644' 
  AND token = 'S1reLhqBbs85AdicRev5FPzXM1IIZnnzCmuEIIiCqmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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