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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebef074380404a9d4c0c8d07bd5feb9945f5664fe1d7a8bf093db039870aee4f' 
  AND token = 'Zc4+xv/MpTDr7udRNaWrjjtm18QOgewe75QUc6yVF30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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