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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f2417b8b47d789cbc292ed804d8a4a24b8d677b8c8ddd38e2411eddfe7f015' 
  AND token = 'KUFx4Vmgq917AhyQGZCkdH2U3S9UfM1fBkmA69rQ/Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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