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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b7929f634991f3c36ea0c6436648a24261cc5cb796078fb8efaa65796e2f18' 
  AND token = 'twr2jhoXMTFaedWRHIJGIf/Ce+OouL8m1X/SGtxp888=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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