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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdaec4b21827a055b8f25168c900b681b6d948b7d3165592f35c7c85926a1ed' 
  AND token = 'xLBthbNNxADf6gmIyX0f3Ugf1v/BNPskadn/Vpc4870=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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