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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fa0852765d64cd6c985a89c3abc33391b9046fd7039c05e2d7dd041c237da3' 
  AND token = 'nO34LRlK1y/c7xwamy7s8LMGpft+Odn9r+BSgjXEyiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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