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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ce4ff3e5420858d640543ffdc838845252ad8b0d24e3f63d6bd711a4efe2a9' 
  AND token = '/pMR152R2uttkI/reVbC8+EIUupWaO5c/yzcBGG8Vvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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