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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202920d032016313c6a7b049f6a46fe6a828eab4eb994e490f40130e45f9f83d' 
  AND token = '8FxmI7xDNcH1EnbHOpo+d2hg0m8VQVrRp8SGi99X8kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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