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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82631c6fba4a909f0609f54ef08565b4f001dd877a2e68b9eab78e0955099413' 
  AND token = 'BgQqsBQomyzt6+RzYfh54pijpAX+6f4v0nLFJPBeef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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