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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b60054ad8fc89ac92a071b1bed0e8c09ccb2138bf303b19c6906c2ece7a1f22' 
  AND token = 'XfN8LJ8SIg3aC2H3gL4l893LMOLCMKtvtxP1kMlXPMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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