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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bb642f63b573670e9baf5fb34f46dd2e41ff8ccac9d02589d7b7bf7b3e507c' 
  AND token = 'nS+L58u2xjQgk0fmmrR/rxrMz8EYnKaz/WDmG78mEIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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