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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8890ef07414339a28af8fdff876f97fc5ddebd728ee0516b04f3a9006a6bab8d' 
  AND token = '23uoW151aSdaLhDw5yILrdEo6G4bVXSZgA/uwB4ZVWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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