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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7330c606ff02b395c78891226813057621718d770743d73e34528f9067a84707' 
  AND token = '5H7T05ftTap55NHClJOtb6CpBs5ip0iGV8Oom5eFB+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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