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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1161d98dd9a52984acaea97ab613fc6e516d3fcb1759d8ce58a5c02a7e40819d' 
  AND token = 'g3MhZKL/Wq1031Nky030+iGKOIxDIMwAVLt3/MYmzh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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